IPSW Portal

Choose aProduct→Choose aPlatform→Choose aVersion→ClickDownload

Download 4.3 (15T5209a) for Apple Watch Series 3 (38mm, LTE)

Version:	4.3
Build:	15T5209a
Signed:	No
Size:	0.35 GB
Release Date:	2018-03-12 20:07:39
Upload Date:	2018-03-09 20:03:35

Secure download directly from Apple's servers